a$.$ Determine the dose required for turbidity removal for each coagulant $($careful with

interpolation$)$

b$.$ Determine the dose required for Stage $1$ TOC removal for each coagulant

c$.$ If alum costs $$0\mathrm{.}15$ per lb $,$ and ferric chloride costs $$0\mathrm{.}20$ per lb $,$ which will be most

economic for this water based on the overall removal needed